YANFLY'S PARTY SYSTEM SCRIPT

I’m gonna be using this script for my game, but i have a problem. I’m trying to make an event in my game where you have 5 characters to choose from, but can only take 4. main character is locked in the party, 2 of them are reserve slots, so i just need 1 more party member, but they don’t appear in the party select screen. Everything else works fine.

Here's the link to his party script.
http://dl.dropbox.com/u/49701990/YEA/Party_System.rb